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NFS: Add nfs4_unique_id boot parameter

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An optional boot parameter is introduced to allow client
administrators to specify a string that the Linux NFS client can
insert into its nfs_client_id4 id string, to make it both more
globally unique, and to ensure that it doesn't change even if the
client's nodename changes.

If this boot parameter is not specified, the client's nodename is
used, as before.

Client installation procedures can create a unique string (typically,
a UUID) which remains unchanged during the lifetime of that client
instance.  This works just like creating a UUID for the label of the
system's root and boot volumes.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
2012-09-14 17:24:41 -04:00
committed by Trond Myklebust
parent 05f4c350ee
commit 6f2ea7f2a3
5 changed files with 59 additions and 4 deletions
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6
fs/nfs/nfs4proc.c
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@@ -4068,9 +4068,13 @@ static unsigned int
nfs4_init_uniform_client_string(const struct nfs_client *clp,
char *buf, size_t len)
{
char *nodename = clp->cl_rpcclient->cl_nodename;
if (nfs4_client_id_uniquifier[0] != '\0')
nodename = nfs4_client_id_uniquifier;
return scnprintf(buf, len, "Linux NFSv%u.%u %s",
clp->rpc_ops->version, clp->cl_minorversion,
clp->cl_rpcclient->cl_nodename);
nodename);
}
/**